Abstract
Experimental studies are carried out on the following points to clarify the properties of surface machined by electric discharge grinding ; roughness, hardness and wear resistance of pure iron, mild steel, S45C steel, SKH steel and sintered carbide alloy. Life test of discharge grinding carbide tool is also investigated.The following conclusions are obtained :(1) Surface roughness increases as electrostatic capacity of condenser increases and is independent to the discharge-frequency per unit time within the range investigated.(2) Hardness of discharge grinding surface layer increases because of work-hardening or change of structure of metallic surface.(3) Wear rate of discharge grinding SKH steel surface is one-half of that of the mechanical grinding surface. Wear rate of sintered carbide alloy machined by electric discharge grinding has the same degree as by diamond grinding wheel.(4) Tool life of carbide tool machined by electric discharge grinding becomes long because the mechanical property of the surface layer of a carbide tip is improved. Face, frank and cutting edge of carbide tool machined by electric discharge grinding have a maximum height roughness of 1.5 microns.
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